User guide

Chapter 6—Using the Software
130 MultiVOIP® Voice/Fax over IP Gateways
Downloading IFM Firmware
The Interface Module (IFM) is the telephony interface for analog MultiVOIP units. There is one IFM for each
channel of the MultiVOIP unit. For each channel, the IFM handles the analog signals to and from the attached
telephone, PBX or CO line.
The IFM communicates with the main processor to indicate the status of the telephone line. For example, it
might indicate that a phone is off hook (FXS) or that an incoming ring is present (FXO).
The IFM receives operating instructions from the VOIP’s main processor. For example, the IFM might be
instructed to ring the phone (FXS) or seize the line (FXO). The IFM contains a codec (coder/decoder) to convert
the incoming audio to a PCM stream (pulse code modulation) which it sends to the DSP (digital signal processor).
The IFM’s codec also converts outgoing PCM to audio.
The firmware of the IFMs can change over time. As such, you may need to upgrade the firmware. To upgrade
firmware:
1. In the System Information window of the MultiVOIP Configuration software, check the version number of
the IFM firmware already installed on the MultiVOIP unit. Write down the version number.
2. Exit the Configuration software program. The MultiVOIP Configuration program must be off when invoking
the Download IFM Firmware command. If it is on, the command does not work.
3. To use the Download IFM Firmware command, go to Start | Programs | MultiVOIP x.xx | Download IFM
Firmware.
4. A dialog box opens. Click OK.
5. The “Boot” LED on the front panel of the MultiVOIP comes on.
6. The software searches for an IFM firmware file to use to upgrade the system. If the file found represents
firmware newer than that already installed on the MultiVOIP (or if you want to overwrite the same version
of firmware) click Open.